JPH0221047A - Transmission endless belt - Google Patents

Abstract

PURPOSE:To prevent a pin from being detached when centrifugal force is exerted on a clip, by providing a retaining member formed of plate-shaped materials and adapted to retain both ends of the pin, and inserted in between blockunits being adjacent to each other. CONSTITUTION:A retainer 5 (a retaining member) retains both ends of a pin 4 for connecting the link lines of an endless belt 1 together, and has its base 51 inserted into a space defined by the respective projecting parts 22, 32 of block units Y disposed in adjacent relationship to each other. In the case of being mounted to a first block 10, the retainer 5 is unfailingly secured to the upper part of the block 10 by a pressing part 53 and insertion parts 54, 54 provided in the retainer 5, and the block 10 and the retainer 5 are constantly held in closed relationship to each other, while the retainer 5 has its bended portions 56, 56 on both sides thereof engaged with protrusively curved portions 24, 24 formed on the arm portions 17b, 17b on both sides of the upper part 17 of the block 10; thus sideward idling movement of the retainer 5 is controlled for unfailingly positioning the pin 4 thus retained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an endless transmission belt used in a chain type continuously variable transmission.

[Prior art] A chain-type continuously variable transmission has a pair of pulleys with conical surfaces facing each other arranged coaxially, and an endless belt in which blocks having a cross-sectional shape that contact the conical surfaces of the pulleys are connected in the form of a chain. The power transmission mechanism is constructed by
A type of transmission is known that performs continuously variable speed by adjusting the effective radius between the pulley and the belt by changing the distance between the conical surfaces of opposing pulleys.

The endless belt used in this type of continuously variable transmission consists of a block whose front face is approximately trapezoidal, with the side surface in contact with the conical surface of the pulley, which is fitted around the link, and pins are inserted into the shaft hole formed in the link. A joint is formed by inserting the links, and an endless belt is constructed by joining these links at a predetermined pitch. The pin that connects this link must have an appropriate gap between it and the shaft hole of the link to allow the link to pivot, and the pin must be inserted so that it can move in and out of the link. become. Therefore, a member is required to hold both ends of the pin protruding from both ends of the link.

Japanese Unexamined Patent Publication No. 59-99143 discloses multiple types of clips for holding both ends of the pin in this type of endless belt.6 The clips in the above publication are made of elastic plate material or Using wire rods as materials, these materials are formed into a nearly C-shaped front shape, and both open ends of the C-shaped clip are elastically engaged with both ends of the pin to hold the free end of the pin. are doing.

This clip can be attached to either the outer circumference side or the inner circumference side of the endless belt, but if it is attached to the inner circumference side, when the belt rotates and centrifugal force is applied to the clip, Although the risk of the clip coming off can be avoided, when the belt passes through the pulley, the blocks and links are bent inward and easily interfere with the clip.

This has the disadvantage that the pivot range of the link is restricted, and considering the ease of attaching and removing the clip from the link, it is ultimately more advantageous to attach the clip to the outer circumference of the belt, but centrifugal force Measures are needed to counter this.

[Problems to be Solved by the Invention] In the conventional endless belt as described above, the clip, which is a holding member for the pin attached to the outer circumferential side of the belt, simply holds the pin by the elastic force of the clip. Therefore, when centrifugal force is applied to the clip, there is a problem that the clip tends to separate from the pin.

[Means for Solving the Problems] In order to solve the problems of the prior art described above, the present invention has an approximately trapezoidal outer shape in the front shape, and at least one through hole formed in the center and on both left and right side edges. A block unit consisting of a first and a second block arranged in the plate thickness direction so as to sandwich a pair of pins, each having a cutout portion formed and opening in the inclined contact surface, and a thin plate link piece. Rows of links are overlapped by a predetermined dimension in the thickness direction, and one end of each link piece in the length direction is pivoted to the other end of the adjacent link piece in the thickness direction using a pin common to the link rows. By this, the link rows are connected in an endless manner, and each link row is fitted into the through holes and cutouts of the block units arranged in the plate thickness direction. The basic configuration includes a holding member made of a plate-like material that is inserted and holds both ends of the pin.

[Function of the Invention] By having the above-mentioned means, the present invention interposes a holding member for the pins that pivotally support the link rows constituting the endless belt at intervals on the outer circumferential side of each block unit, and the plate-shaped holding member The base of the block unit prevents the interval between the block units from becoming narrower than specified. Since this holding member is closely attached to one side of the block and constantly moves together with the block, there is no impact between the holding member and the block.
Since a portion of the holding member is in contact with the lower surface of the upper side of the block, reliable engagement is maintained even when centrifugal force is applied to the holding member.

[Embodiment] FIGS. 1 to 3 show a first embodiment of the present invention, FIG. 1 is a partially cutaway side view thereof, and FIG.
-A sectional view and FIG. 3 are perspective views of the holding member.

The endless belt, designated as a whole by reference numeral 1, includes a pair of block units Y consisting of a first block 10 and a second block 30 arranged to sandwich a pair of pins 4, and an adjacent block unit Y, respectively. The basic structure includes a link piece 3 that connects the pins held together, and a holding member 5 that is inserted between each block unit Y and an adjacent block unit Y to hold both ends of the pin. The link pieces 3 are made of a thin metal plate with an opening 2 formed inside, and the link rows 3 are shifted by half a pitch from each other in the longitudinal direction and overlapped by a predetermined dimension in the thickness direction to form a link row. The link rows are arranged in three parallel rows at intervals in a manner to be described later, and the link pieces 3 are pivoted by pins 4 that serve as joints common to each row.

As shown in FIG. 1, the pin 4 has a vertically symmetrical cross-sectional shape, and includes a swinging part 41 made of an arc with a large diameter, a bottom part made of an arc somewhat smaller than the above-mentioned arc, and the swinging part A pair of rod-shaped members made up of a straight line formed on the opposite side of 41 and a rotation prevention part 42 consisting of an arc with a small diameter touching the straight line are brought into contact with each other at each swinging part, and the length thereof is With both ends slightly protruding from the outer surface of the link piece 3 located at the outermost side of the three link rows, the 3
The length is such that an appropriate distance is created between the rows of links, and there are recesses on both sides of the opening 2 of the link piece 3 in the length direction of the link piece 3 to fit into the rotation prevention part 42 of the pin 4. Each link row in this embodiment is constructed as described above, with the center link row having seven link pieces 3 and the outer link rows each having four link pieces 3 stacked in the plate thickness direction. ing.

The first and second blocks 10.30 are made of metal plates, and the front shape of each has a substantially trapezoidal outer shape with one side edge as a hypotenuse as shown in FIG. The upper side 17 and the lower side 18 are formed by cutouts 11, 11 opening at the center of both side edges, and a through hole 12 opening at the center.
is formed. The central portion of the upper side portion 17 facing the through hole 12 is formed into an upwardly protruding circular arc portion 17a, and both sides facing the cutout portions 11, 11 are arm portions 17b.

17b. The central portion of the lower side portion 18 facing the through hole 12 is formed into a circular arc portion 18a projecting downward, and the both sides facing the notched portions 11 are formed into arm portions 18b, 18b.

An inclined contact surface 13.14 is formed on the end face of the arm part 17b of the upper side part 17 and the arm part 18b of the lower side part 18, which sandwich the cut parts 11, 11, to come into contact with the conical contact surface of the pulley. has been done. The cutout portion 11.11 is a U-shaped cut from approximately the center of both side edges to a depth sufficient to accommodate a predetermined number of outer link rows stacked inward in the left and right width direction of the block. The arm portion 17 of the upper side portion 17
A curved protrusion 24 is formed between the outer end of the lower surface of b and the inclined contact surface 13.

The through hole 12 is formed in the center of the block, separated by a columnar part 15, 15 having an appropriate width in the width direction of the block from the U-shaped bottom part of the cutout parts 11, 11. This through hole 12 has a width dimension that allows a row of links passing through the inside to be fitted loosely in the width direction, and the upper and lower shapes are the lower edge of the circular arc portion 17a of the upper side portion 17 and the upper portion of the circular arc portion 18a of the lower side portion 18. It has a shape that corresponds to the shape of the edge.

The vertical widths of the notches 11, 11 and the through holes 12 are set to be slightly longer than the plate width of the link piece 3.

A rectangular groove 21 into which the pin 4 is received is formed in the center of one surface of the columnar section 15.15 of the first block in a direction transverse to the columnar section 15. The first surfaces 19 and 20 of the block extending from the center of the groove 21 toward the upper and lower ends of the block are inclined such that both surfaces intersect at the center of the groove 21 at an obtuse angle.

On the second surfaces 26 and 27 of the block 10, a protrusion 22 is provided on the opposite surface of the columnar part 15 from the groove 19, and the protrusion 22 has a central portion that is higher. An arcuate surface with a large curvature is formed.

Of both side surfaces of the second block 30, the first surface facing the first surface of the first block 10 is formed into an inclined surface 39.40 similar to the surface 19.20 of the first block 10. A rectangular groove 31 for receiving the pin 4 is provided in the center of the columnar part 35, facing the groove 21 of the first block 1o.

The second surfaces 36 and 37 of the second block 30 are the first surface 39
．． However, a protruding part 32 is provided on the opposite surface of the columnar part 35 from the groove 31, and the surface of the protruding part 32 has a flat surface or a curvature so that the central part is higher. It is formed into a large arcuate surface.

The pin 4, which is a common joint of the link row, is connected to the first and second pins.
The through holes 12 are engaged with opposing grooves 21.31 formed in each of the two pillars 15.35 of the blocks 10.30.
It penetrates and supports the opening 2 of the link piece 3 of the central link row inserted into the columnar part 15.35, and penetrates the outer link row inserted into the cutout parts 11, 11 on the outside of the columnar part 15.35.
Both ends of the pin 4 protrude slightly outward from the outermost link piece 3. Both ends of the pin 4 connecting the link rows of the endless belt 1 are held by a holding member, and some elements constituting this holding member are attached to the first and second blocks 10.
30 is inserted into the space on the outer circumferential side of the chain. The interval formed by the first and second blocks 10.30 is the interval formed by the mutually opposing first surfaces of the first and second blocks including the pin 4, and the second surface side opposite thereto.
In other words, there is a gap formed by joining the protruding parts 22.32 of the columnar parts 15.35, but the holding member is
The spacing formed by the projections 22.32, i.e.
It is inserted into the interval formed between adjacent block units Y.

FIG. 3 is a perspective view showing an embodiment of a holding member called a retainer for holding both ends of the pin 4.

The retainer, which is generally designated by the reference numeral 5, is made of a metal plate or resin, and has a plate-shaped base that is inserted in the width direction with respect to the above-mentioned interval formed by the first block 10 and the second block 30. It is equipped with 51. The central upper edge of the base 51 is bent to protrude toward the first block 10 in the thickness direction by a predetermined width to form a presser portion 53, which is attached to the upper edge of the first block 10. Part 17
It comes into contact with the upper surface of the arcuate portion 17a. Therefore, the presser portion 53 is curved in an arc shape along the arcuate portion 17a. A pair of truncated conical projections 52 52 are formed on both sides of the base 51 and project toward the first block 10 .
The lower edges on both sides of the base portion 51 are bent by a predetermined width in the thickness direction at a substantially right angle in the same direction as the protrusion 52 to form the insertion portion 54.
．． 54 is formed. As shown in FIG.
It is inserted into the gap formed by the lower edge and the upper edge of the link piece 3 installed in the notch 11.

That is, the retainer 5 holds the upper side 17 of the first block 10 from above and below between the presser part 51 formed at the center of the base 51 and the insertion parts 54 and 54 on both sides of the first block. It comes into close contact with the second surface 26 of one block 10 and always moves together.

The outer end edge of the insertion portion 54 that is orthogonal to the base 51 is bent at a substantially right angle so as to protrude on the opposite side from the base 51 to form an arm portion 55 . The insertion portion 54 and the arm portion 55 are connected by a two-stage arcuate bending portion 56, and when the retainer 5 is attached to the first block 10, the outer portion of the arcuate bending portion 56 is connected. Arm portion 17 of block upper side portion 17
It engages with a curved protrusion 24 formed on the lower surface of the outer end of b to restrict sideward movement of the retainer 5. The distance between the opposing inner surfaces of the pair of arm portions 55, 55 formed at both ends of the retainer 5 corresponds to the length of the pin 4 to be held, and both ends of the pin 4 are held.

In the retainer of this embodiment, when the retainer 5 is attached to the first block 10, the retainer 5 is attached to the first block 10 by the holding part 53 and the insertion part 54,54 provided on the retainer 5.
It is securely attached to the upper side 17 of the block 10, and the block and retainer are always kept in close contact. At the same time, the bent portions 56 and 56 on both sides of the retainer 5 are connected to the arm portions 17b and 17b on both sides of the upper side 17 of the first block 10.
The retainer 5 is engaged with a curved protrusion 24.24 formed on the lower edge of the retainer 5, thereby restricting sideward movement of the retainer 5, and ensuring the positioning of the held pin 4.

Further, since the plate-shaped base portion 51 is inserted into the gap between adjacent block units Y on the outer circumferential side of the chain, the gap is maintained and the chain is prevented from bending toward the inner circumference. Furthermore, in the retainer 5 of this embodiment, a pair of truncated cone-shaped protrusions that protrude toward the first block 10 are provided on both sides of the base 51, so that the function of maintaining the distance between the block units is further improved. do.

FIG. 4 shows another embodiment of a retainer as a holding member, in which the retainer 6 is made of a metal plate or resin, and the first block 10 and the second block 30 are similar to the above-mentioned example. A plate-shaped base portion 61 is provided as a spanning portion that is inserted in the width direction with respect to the interval formed by.

The upper edges of both sides of the base portion 61 are bent to protrude toward the first block 10 in the thickness direction by a predetermined width to form presser portions 63 and 63. And the base 6
The lower edges of both sides of the insertion part 64.
64 is formed. Therefore, when this retainer 6 is attached to the first block 10, the pair of presser parts 63 and insertion part 64 provided on the upper and lower edges of the side part of the base part 61 are attached to the first block 10.
The arm portion 17b of the upper side portion 17 of the block 10 is held between the upper and lower sides, and the retainer 6 is securely attached to the second surface 26 of the first block 10.

The outer end edge of the insertion portion 64 extending perpendicularly to the base 61 is bent at a substantially right angle so as to protrude on the side opposite to the base 61 to form an arm portion 65 . The insertion portion 64 and the arm portion 65 are connected by a two-stage arcuate bent portion 66, and when the retainer 6 is attached to the first block 10, the outer portion of the arcuate bent portion 66 is connected. Arm portion 17 of block upper side portion 17
It engages with a curved protrusion 24 formed on the lower surface of the outer end of b to restrict sideward movement of the retainer 6. The distance between the opposing inner surfaces of the pair of arms 65, 65 formed at both ends of the retainer 6 corresponds to the length of the pin 4 to be held, and both ends of the pin 4 are held.

In the retainer of this embodiment, when the retainer 6 is attached to the first block 10, the retainer 6 is attached to the second part of the upper side part 17 of the first block 10 by the presser parts 63 and the insertion parts 64 provided on both sides of the retainer 6. The device is securely attached to the surface 26 of the device.

At the same time, the retainer 6 has the bent portions 66, 66 on both sides connected to the first
Arms 17b, 17 on both sides of the upper side 17 of the block 10
It engages with a curved protrusion 24° 24 formed on the lower edge of b, thereby restricting sideward movement of the retainer 6, and ensuring the positioning of the held pin 4.

In addition, since the plate-shaped base 61 is inserted into the gap between adjacent block units Y on the chain outer circumferential side, one gap is maintained and the chain is prevented from bending inward.

FIG. 5 shows still another embodiment of the retainer as a holding member, in which the retainer 7 is made of a metal plate or resin, and the first block 10 and the second block A plate-shaped base portion 71 is provided as a spanning portion that is inserted in the width direction with respect to the interval formed by the base portions 30 . The central upper edge of the base 71 is bent to a predetermined width so as to protrude toward the first block 10 in the thickness direction, forming a presser portion 73 as in the embodiment shown in FIG. .

The central lower edge of the base 71 facing the presser portion 73 is bent toward the same side as the presser portion 73 with a width larger than the width of the presser portion 73 to form a support portion 74 .

Therefore, when this retainer 7 is attached to the first block 10, the opposing presser part 73 and the support part 74 are connected to the first block 10.
Arc portion 17 formed at the center of the upper side 17 of the block 10
The retainer 7 is reliably engaged with the second surface 26 of the first block 10 by holding the block a from above and below.

For this reason, the front shape of the presser part 73 and the support part 74 is
It has a shape corresponding to the shape of the circular arc surfaces of the upper and lower sides of the circular arc portion 17a of the upper side portion 17 of the block 1o. Since the presser portion 73 and the support portion 74 engage with the first block 10 on an arcuate surface, sideward movement of the retainer 7 is also restricted.

On the other hand, both sides of the base 71 hang downward within the same plane as the base 71 with a predetermined width to form hanging parts 72 and 72. The inner edge of the hanging portion 72.72 is bent in the thickness direction in the same direction as the support portion 74 to form a pair of opposing arm portions 75.75. A pair of support portions 76.76 that bulge outward are formed at the lower ends of the distal ends of the arm portions 75.75. The spacing between the opposing inner surfaces of the support portions 76.76 corresponds to the length of the pin 4 to be held, and both ends of the pin 4 are held.

In the retainer 7 of this embodiment, the retainer 7 is fitted onto the circular arc portion 17a of the upper side portion 17 of the first block 10 by the pair of presser portions 73 and the support portions 74, each having an arcuate front shape. is securely attached to the first block 10 without any movement in the vertical or horizontal directions. Also, both ends of the pin 4 are connected to the arm portions 75 and 75 of the retainer 7.
It is securely held by stepped supports 76.76 formed in the . In the glue retainer 7 of this embodiment as well, the plate-shaped base 71 is inserted into the gap between the chain outer circumferential sides formed by the adjacent block units Y, so that the gap is maintained and the chain is prevented from bending inward. To prevent.

[Effects of the Invention] The present invention provides a first block in which plate-shaped blocks having a substantially trapezoidal front shape, which are basic elements constituting this type of endless belt, are arranged so as to sandwich a pair of pins; When forming a block unit with a second block and connecting block units lined up in the board thickness direction with a link row, the interval formed by adjacent block units is
Since a pin retainer with a plate-shaped base is interposed between the outer circumference of the belt, the interval on the outer circumference of the belt is actively maintained, and the belt tends to sag toward the inner circumference in the straight portion of the belt. This can be prevented. Therefore, string vibrations generated in the belt when the belt runs are prevented, noise caused by vibrations can be reduced, and the durability of the belt and pulleys is also improved.

In addition, the plate-shaped block has an upper side and a lower side defined by at least one through hole formed in the center and cutouts opening on both left and right edges, and an upper side and a lower side. The upper side has an upwardly curved arc part formed between the columnar parts, arm parts provided on both sides outside the columnar part, and an outer end of the lower surface of the arm. It has a curved protrusion formed therein.

On the other hand, in the retainer according to claim 1, the retainer that is inserted into the space between the plate-shaped block units and attached to the blocks is formed by bending the center part of the upper edge of the plate-shaped base toward the first block. A pressing portion is formed to press the upper edge of the circular arc portion formed at the center of the upper side of the block. Then, since the insertion part is formed by bending the lower edges on both sides of the base to the same side as the holding part, the upper side of the first block is held from above and below by this holding part and the insertion part to securely attach the retainer. be able to.

The mounted retainer always moves in unison with the first block, and the retainer and block are maintained in close contact with each other, so it is possible to prevent the generation of noise and damage to parts due to impact. Since the insertion part of the retainer is inserted into the lower edge of the arm on the upper side of the block and engages with the block, even when the belt rotates around the pulley and centrifugal force is applied to the entire belt, the retainer is securely held by the block, and the retainer will not come off due to centrifugal force.

Further, the outside of the holding portion is regulated by a curved protrusion formed on the lower surface of the arm portion of the block, thereby preventing the pin from shifting in the axial direction.

Furthermore, in the present invention, since frustoconical projections are provided on both sides of the base, when a retainer is interposed between the block units, these projections actively maintain the interval between the block units, and the belt can be prevented from deflecting toward the inner circumference.

Next, in the retainer according to claim 2, the upper and lower edges of both ends of the plate-shaped base are bent at a substantially right angle toward the first block to form a holding part and an insertion part. The retainer is attached to the first block by holding the arms on both sides of the upper side of the first block from above and below. With this configuration, the retainer is integrally attached to the first block to maintain the interval between the block units, and even when a centrifugal force is applied to the retainer, the clamping part comes into contact with the lower surface of the block arm and does not come off.

Further, in this retainer as well, the bent portion continuous with the outer arm portion of the holding portion engages with the curved protrusion formed on the lower surface of the arm on the upper side of the first block, thereby restricting the lateral movement of the retainer. Therefore, the pins held by the arms of the retainer can be prevented from shifting in the axial direction.

In the retainer according to the third aspect of the present invention, the upper and lower edges of the central portion of the plate-shaped base are bent at a substantially right angle toward the first block to form the pair of presser portions and the support portion. The presser part and the support part are formed in such a shape that the front surface thereof tightly engages with the upper and lower surfaces of the upwardly curved arc part of the upper side of the first block.

Therefore, when the retainer is attached to the upper side of the first block using the presser and support, the presser and the support, which have a curved front shape, clamp the arcuate portion of the upper side of the retainer from above and below. , the retainer is simultaneously positioned vertically and horizontally to ensure secure attachment. That is,
The retainer is tightly fitted against the second surface 26 of the first block even when an upward centrifugal force is applied to the retainer or when a force trying to move the retainer laterally is applied; It always moves in unison with the block, and no deviation occurs between it and the block.

Further, the plate-shaped both sides extend downward to form a hanging part, and the inner edge of this hanging part is bent at a substantially right angle to form an arm part.

In this retainer, the lateral positioning of the retainer is achieved by the presser portion and the support portion.

It is no longer necessary to engage and restrict the outside of the insertion portion with the curved protrusion on the lower surface of the arm of the retainer as in the above-mentioned retainer.

As described above, by using the holding member of the present invention, it is possible to reliably hold both ends of the pin, and the plate-shaped base of the holding member is inserted into the interval between the block units formed on the outer circumferential side of the belt. Actively maintain this interval,
Prevents the belt from bending inward.

Further, since the holding member is attached to the block so as to sandwich the upper side of the plate-shaped block from above and below, it always moves in close contact with the block during belt operation. therefore,
without any striking movement occurring between the block and the holding member;
The occurrence of noise, damage, etc. can be prevented.

Furthermore, since a part of the holding member is attached to the lower surface of the upper side of the block, it has the advantage of being able to sufficiently resist centrifugal force.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, FIG. 1 is a partially cutaway side view thereof, and FIG. 2 is an A--
FIG. 3 is a perspective view of the beam chisel, FIG. 4 is a perspective view of another embodiment of the retainer, and FIG. 5 is a perspective view of still another embodiment of the retainer. 1... Endless belt, 4... Pin. 10...First block 1. 12...Through hole, 17...Upper side part, 30...Second block. 52... Protrusion. 54...Insertion part. 61... Base, 64... Insertion part, 71... Base. 73... Presser section. 75... Arm part, 3... Link piece, 5... Clip, 11... Notch part, 13.14... Inclined contact surface, 18... Lower side part, 51... Base part . 53... Presser part, 55... Arm part, 63... Presser part, 65... Arm part, 72... Hanging part, 74... Support part, 76... Support part. Patent applicant: Aisin AW Co., Ltd. Representative: Patent attorney: Masaaki Suzuki (2 others) Condolences

Claims (4)

[Claims] (1) For transmitting torque between a pair of pulleys having a contact surface formed by coaxially opposing two conical surfaces, an inclined contact surface that comes into contact with the contact surface of the pulley is attached to one side of both edges. An endless belt for power transmission in which a large number of plate-shaped blocks formed in a section are connected together by a plurality of link rows, has an approximately trapezoidal outer shape when viewed from the front, and has at least one through hole formed in the center and formed on both left and right edges. A plurality of block units each including a first block and a second block, each having a cutout opening at the inclined contact surface and arranged in the plate thickness direction so as to sandwich a pair of pins, and a thin plate link piece. A block arranged in the thickness direction, consisting of multiple link rows connected in an endless manner by pivoting one end in the thickness direction to the other end of an adjacent link piece in the thickness direction using a pin common to the link rows. A retainer that holds both ends of the pins of the plurality of link rows fitted in the through holes and cutouts of the unit is interposed in the interval on the belt outer circumferential side formed in the plate thickness direction between adjacent block units, The retainer includes a plate-shaped base inserted into the interval between the block units, and a presser portion formed by bending at least an upper edge of the base substantially at right angles in the thickness direction, and the retainer is attached to the first or An endless belt for power transmission, characterized in that it is locked to a second block. (2) For transmitting torque between a pair of pulleys having a contact surface formed by coaxially opposing two conical surfaces, an inclined contact surface that comes into contact with the contact surface of the pulley is attached to one side of both edges. An endless belt for power transmission in which a large number of plate-shaped blocks formed in a section are connected together by a plurality of link rows, has an approximately trapezoidal outer shape when viewed from the front, and has at least one through hole formed in the center and formed on both left and right edges. A plurality of block units each including a first block and a second block, each having a cutout opening at the inclined contact surface and arranged in the plate thickness direction so as to sandwich a pair of pins, and a thin plate link piece. A block arranged in the thickness direction, consisting of multiple link rows connected in an endless manner by pivoting one end in the thickness direction to the other end of an adjacent link piece in the thickness direction using a pin common to the link rows. A retainer that holds both ends of the pins of the plurality of link rows fitted in the through holes and cutouts of the unit is interposed in the interval on the belt outer circumferential side formed in the plate thickness direction between adjacent block units, The retainer includes a plate-shaped base inserted into the space between the block units, a holding part formed by bending the center upper edge of the base almost at right angles in the plate thickness direction, and lower edges of both side ends of the base. an insertion part formed by bending at a substantially right angle on the same side as the holding part; and an arm part that abuts the end of the pin, which is formed by bending the outer edge of the insertion part further downward and at a substantially right angle in the plate thickness direction. An endless belt for power transmission, characterized in that the retainer is locked to the first or second block. (3) For transmitting torque between a pair of pulleys having a contact surface formed by coaxially opposing two conical surfaces, an inclined contact surface that comes into contact with the contact surface of the pulley is attached to one side of both edges. An endless belt for power transmission in which a large number of plate-shaped blocks formed in a section are connected together by a plurality of link rows, has an approximately trapezoidal outer shape when viewed from the front, and has at least one through hole formed in the center and formed on both left and right edges. A plurality of block units each including a first block and a second block, each having a cutout opening in the inclined surface and arranged in the plate thickness direction so as to sandwich a pair of pins, and a link piece of the groove plate are connected to the plurality of block units. A block unit arranged in the plate thickness direction, consisting of a plurality of link rows connected in an endless manner by pivoting one end in the thickness direction to the other end of an adjacent link piece in the thickness direction with a common pin of the link pieces. A retainer for holding both ends of the pins of the plurality of link rows fitted into the through holes and cutouts of the belt is interposed between adjacent block units at intervals on the belt outer circumferential side formed in the plate thickness direction, and The retainer includes a plate-shaped base inserted into the space between the block units, a holding part formed by bending the upper edges of both side ends of the base almost at right angles in the plate thickness direction, and a lower edge of both side ends of the base. an insertion part formed by bending at a substantially right angle on the same side as the holding part; and an arm part that abuts the end of the pin, which is formed by bending the outer edge of the insertion part further downward and at a substantially right angle in the plate thickness direction. An endless belt for power transmission, characterized in that the retainer is locked to the first and second blocks. (4) For transmitting torque between a pair of pulleys having a contact surface formed by coaxially opposing two conical surfaces, an inclined contact surface that comes into contact with the contact surface of the pulley is attached to one side of both edges. An endless belt for power transmission in which a large number of plate-shaped blocks formed in a section are connected together by a plurality of link rows, has an approximately trapezoidal outer shape when viewed from the front, and has at least one through hole formed in the center and formed on both left and right edges. A plurality of block units each including a first block and a second block arranged in the plate thickness direction so as to sandwich a pair of pins, and a thin plate link piece having a notch opening in the inclined surface. A block unit arranged in the thickness direction, consisting of a plurality of link rows connected in an endless manner by pivoting one end in the width direction to the other end of an adjacent link piece in the thickness direction with a pin common to the link rows. A retainer for holding both ends of the pins of the plurality of link rows fitted into the through holes and cutouts of the belt is interposed between adjacent block units at intervals on the belt outer circumferential side formed in the plate thickness direction, and The retainer includes a plate-shaped base inserted into the space between the block units, a holding part formed by bending the central upper edge of the base at a substantially right angle in the plate thickness direction, and a holding part forming the central lower edge of the base. A supporting part formed by bending at an almost right angle to the same side, a hanging part extending downward from the lower edges of both ends of the base part, and an inner edge part of the hanging part formed by bending at an almost right angle to the same side as the supporting part. An endless belt for power transmission, comprising an arm portion that abuts an end portion of the pin formed by bending, and the retainer is locked to the first or second block.